30 September 2017

Nokia M/90 (Panasonic CF-U1): FSK 301-151Bd 780Hz shift

I reported Nokia M/90 / Panasonic CF-U1 301-401Bd/780Hz in this post, this time I copied the 301-151Bd waveform on 10737.7 KHz (cf) around 1235 UTC. In this sample the initial 301Bd burst seems to be used with a different functionality (fig. 1). Sanomalaite
M/90 (SANLA) (Literally "Message device M/90") is a digital, portable
and encrypted text-based communications device developed by Nokia and
used by all branches of Finnish Defence Forces. From 2013 onward, these
devices are being replaced with Panasonic CF-U1 Toughbook.

Fig. 1

Note that also in this case, the preamble is always modulated at 301Bd (fig. 2).

Fig. 2

For what concerns the characteristics of the demodulated stream, refer to thementioned post.